From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754510AbcEWK6x (ORCPT ); Mon, 23 May 2016 06:58:53 -0400 Received: from foss.arm.com ([217.140.101.70]:50205 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754493AbcEWK6u (ORCPT ); Mon, 23 May 2016 06:58:50 -0400 From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: dietmar.eggemann@arm.com, yuyang.du@intel.com, vincent.guittot@linaro.org, mgalbraith@suse.de, linux-kernel@vger.kernel.org, Morten Rasmussen , Russell King Subject: [PATCH 15/16] arm: Set SD_BALANCE_WAKE flag for asymmetric capacity systems Date: Mon, 23 May 2016 11:58:57 +0100 Message-Id: <1464001138-25063-16-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com> References: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Asymmetric capacity systems (e.g. ARM big.LITTLE) can not rely exclusively on fast idle-based task placement at wake-up in all scenarios. Enable SD_BALANCE_WAKE to have the option to do load/utilization based wake-up task placement (existing tasks) if affine wake-up fails. cc: Russell King Signed-off-by: Morten Rasmussen --- arch/arm/kernel/topology.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c index 1b81b31..32d0a1b 100644 --- a/arch/arm/kernel/topology.c +++ b/arch/arm/kernel/topology.c @@ -280,18 +280,27 @@ void store_cpu_topology(unsigned int cpuid) static inline int cpu_corepower_flags(void) { - return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; + int flags = SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; + + return big_little ? flags | SD_BALANCE_WAKE : flags; +} + +static inline int arm_cpu_core_flags(void) +{ + int flags = SD_SHARE_PKG_RESOURCES; + + return big_little ? flags | SD_BALANCE_WAKE : flags; } static inline int arm_cpu_cpu_flags(void) { - return big_little ? SD_ASYM_CPUCAPACITY : 0; + return big_little ? SD_ASYM_CPUCAPACITY | SD_BALANCE_WAKE : 0; } static struct sched_domain_topology_level arm_topology[] = { #ifdef CONFIG_SCHED_MC { cpu_corepower_mask, cpu_corepower_flags, SD_INIT_NAME(GMC) }, - { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) }, + { cpu_coregroup_mask, arm_cpu_core_flags, SD_INIT_NAME(MC) }, #endif { cpu_cpu_mask, arm_cpu_cpu_flags, SD_INIT_NAME(DIE) }, { NULL, }, -- 1.9.1